Back-rest for turning-lathes



(No Model.)

W. H. WHITE. BACK BEST FOR TURNING LATHES.

No. 470,229. Patented Mar. 8, 1892.

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WILLIAM H. WHITE, OE I/VOROESTER, MASSACHUSETTS.

BACK-REST FOR TURNlNG-LATHES.

SPECIFICATION forming part of Letters Patent No. 470,229, dated March 8,1892.

Application filed March 9, 1891.

To all whom it may concern.-

Be it known that 1, WILLIAM H. WHITE, a citizen of the United States,residing at Worcester, in the county of WVorcester and State ofMassachusetts, have invented a new and useful Back-Rest forTurning-Lathes, of which the following is a'specitication.

My invention relates to improvements in adjustable back rests; and itsobjects are, first, to provide bearings for three sides of the articlebeing turned, which shall wholly prevent its vibrations under thecutting-tool; second, to afford facilities by which these bearings maybe quickly adjusted to any part along the length of and to any-sizedwork, and, third, to reduce the friction of the bearings upon the workto the smallest amount. I attain these objects by the mechanismillustrated in the accompanying drawing, in which A is the foot or shoewith a slot B,in which slides the'set by which my invention is attachedto the frame of the lathe.

C is an upright socket into which sets the adjustable standard D andheld in place at various heights by the set-screw E, with its handle F.

G is a horizontal slotted arm extending at right angles to and slidingin the grooves of the head of the standard D, and held in place atvarious lengths by the thumb set-screw H. I is a similar horizontaladjustable arm extending at right angles to and sliding in the groove ofthe headof the arm G and held in place at various lengths by the thumbsetscrew J and carrying attached to its head the three adjustable jaws,as shown and marked K K K, and capable of adjustment by their Serial No.884,299. (No model.)

slots and set-screws and carrying at their ends the friction-rollers L LL, which when properly adjusted bear upon three sides of the work beingturned and with slight friction prevents its vibration. The standard Draises the whole to the height of the work, the arm G provides for thesetting of the jaws K K K along the length of the work, and arm Iprovides for the moving of said jaws up to and back from the work.

Another purpose of the arm G is to provide for moving the rest along thelength of the work without loosening the shoe or foot A when onceattached to the lathe.

Having fully described my invention, what I claim, and desire to secureby Letters Patcut, is

1. The combination of asocket and adj ustable standard having a groovedhead with two slotted horizontal adjustable sliding arms at right anglesto each other, the first carried by the grooved head of the standard,thesecond by the grooved head of the first arm,by means of whichcombination the bearings L L L may be moved up to and away from and backand forth along the length of the work without loosening the shoe fromthe lathe or its being necessary to readjust'the shoe, all substantiallyas set forth.

2. The combination, in a backrest for lathes, of the threeindependentadjustable jaws K K K, provided with slots and screws andwith friction-rollers, all substantially as set forth.

WILLIAM H. WVHITE.

Witnesses:

HIRAM F. BROWN, ALICE W. FORBES.

